LCOV - code coverage report
Current view: directory - js/src - jsatom.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 251 203 80.9 %
Date: 2012-04-07 Functions: 23 20 87.0 %

       1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  *
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is Mozilla Communicator client code, released
      17                 :  * March 31, 1998.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  * Netscape Communications Corporation.
      21                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributor(s):
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : /*
      41                 :  * JS atom table.
      42                 :  */
      43                 : #include <stdlib.h>
      44                 : #include <string.h>
      45                 : 
      46                 : #include "mozilla/RangedPtr.h"
      47                 : #include "mozilla/Util.h"
      48                 : 
      49                 : #include "jstypes.h"
      50                 : #include "jsutil.h"
      51                 : #include "jshash.h"
      52                 : #include "jsprf.h"
      53                 : #include "jsapi.h"
      54                 : #include "jsatom.h"
      55                 : #include "jscntxt.h"
      56                 : #include "jsgc.h"
      57                 : #include "jsgcmark.h"
      58                 : #include "jslock.h"
      59                 : #include "jsnum.h"
      60                 : #include "jsstr.h"
      61                 : #include "jsversion.h"
      62                 : #include "jsxml.h"
      63                 : 
      64                 : #include "frontend/Parser.h"
      65                 : 
      66                 : #include "jsstrinlines.h"
      67                 : #include "jsatominlines.h"
      68                 : #include "jsobjinlines.h"
      69                 : 
      70                 : #include "vm/String-inl.h"
      71                 : #include "vm/Xdr.h"
      72                 : 
      73                 : using namespace mozilla;
      74                 : using namespace js;
      75                 : using namespace js::gc;
      76                 : 
      77                 : const size_t JSAtomState::commonAtomsOffset = offsetof(JSAtomState, emptyAtom);
      78                 : const size_t JSAtomState::lazyAtomsOffset = offsetof(JSAtomState, lazy);
      79                 : 
      80                 : /*
      81                 :  * ATOM_HASH assumes that JSHashNumber is 32-bit even on 64-bit systems.
      82                 :  */
      83                 : JS_STATIC_ASSERT(sizeof(JSHashNumber) == 4);
      84                 : JS_STATIC_ASSERT(sizeof(JSAtom *) == JS_BYTES_PER_WORD);
      85                 : 
      86                 : const char *
      87           20539 : js_AtomToPrintableString(JSContext *cx, JSAtom *atom, JSAutoByteString *bytes)
      88                 : {
      89           20539 :     return js_ValueToPrintable(cx, StringValue(atom), bytes);
      90                 : }
      91                 : 
      92                 : #define JS_PROTO(name,code,init) const char js_##name##_str[] = #name;
      93                 : #include "jsproto.tbl"
      94                 : #undef JS_PROTO
      95                 : 
      96                 : /*
      97                 :  * String constants for common atoms defined in JSAtomState starting from
      98                 :  * JSAtomState.emptyAtom until JSAtomState.lazy.
      99                 :  *
     100                 :  * The elements of the array after the first empty string define strings
     101                 :  * corresponding to the two boolean literals, false and true, followed by the
     102                 :  * JSType enumerators from jspubtd.h starting with "undefined" for JSTYPE_VOID
     103                 :  * (which is special-value 2) and continuing as initialized below. The static
     104                 :  * asserts check these relations.
     105                 :  */
     106                 : JS_STATIC_ASSERT(JSTYPE_LIMIT == 8);
     107                 : JS_STATIC_ASSERT(JSTYPE_VOID == 0);
     108                 : 
     109                 : const char *const js_common_atom_names[] = {
     110                 :     "",                         /* emptyAtom                    */
     111                 :     js_false_str,               /* booleanAtoms[0]              */
     112                 :     js_true_str,                /* booleanAtoms[1]              */
     113                 :     js_undefined_str,           /* typeAtoms[JSTYPE_VOID]       */
     114                 :     js_object_str,              /* typeAtoms[JSTYPE_OBJECT]     */
     115                 :     js_function_str,            /* typeAtoms[JSTYPE_FUNCTION]   */
     116                 :     "string",                   /* typeAtoms[JSTYPE_STRING]     */
     117                 :     "number",                   /* typeAtoms[JSTYPE_NUMBER]     */
     118                 :     "boolean",                  /* typeAtoms[JSTYPE_BOOLEAN]    */
     119                 :     js_null_str,                /* typeAtoms[JSTYPE_NULL]       */
     120                 :     "xml",                      /* typeAtoms[JSTYPE_XML]        */
     121                 :     js_null_str                 /* nullAtom                     */
     122                 : 
     123                 : #define JS_PROTO(name,code,init) ,js_##name##_str
     124                 : #include "jsproto.tbl"
     125                 : #undef JS_PROTO
     126                 : 
     127                 : #define DEFINE_ATOM(id, text)          ,js_##id##_str
     128                 : #define DEFINE_PROTOTYPE_ATOM(id)      ,js_##id##_str
     129                 : #define DEFINE_KEYWORD_ATOM(id)        ,js_##id##_str
     130                 : #include "jsatom.tbl"
     131                 : #undef DEFINE_ATOM
     132                 : #undef DEFINE_PROTOTYPE_ATOM
     133                 : #undef DEFINE_KEYWORD_ATOM
     134                 : };
     135                 : 
     136                 : void
     137               0 : JSAtomState::checkStaticInvariants()
     138                 : {
     139                 :     /*
     140                 :      * Start and limit offsets for atom pointers in JSAtomState must be aligned
     141                 :      * on the word boundary.
     142                 :      */
     143                 :     JS_STATIC_ASSERT(commonAtomsOffset % sizeof(JSAtom *) == 0);
     144                 :     JS_STATIC_ASSERT(sizeof(*this) % sizeof(JSAtom *) == 0);
     145                 : 
     146                 :     /*
     147                 :      * JS_BOOLEAN_STR and JS_TYPE_STR assume that boolean names starts from the
     148                 :      * index 1 and type name starts from the index 1+2 atoms in JSAtomState.
     149                 :      */
     150                 :     JS_STATIC_ASSERT(1 * sizeof(JSAtom *) ==
     151                 :                      offsetof(JSAtomState, booleanAtoms) - commonAtomsOffset);
     152                 :     JS_STATIC_ASSERT((1 + 2) * sizeof(JSAtom *) ==
     153                 :                      offsetof(JSAtomState, typeAtoms) - commonAtomsOffset);
     154                 : 
     155                 :     JS_STATIC_ASSERT(JS_ARRAY_LENGTH(js_common_atom_names) * sizeof(JSAtom *) ==
     156                 :                      lazyAtomsOffset - commonAtomsOffset);
     157               0 : }
     158                 : 
     159                 : /*
     160                 :  * Interpreter macros called by the trace recorder assume common atom indexes
     161                 :  * fit in one byte of immediate operand.
     162                 :  */
     163                 : JS_STATIC_ASSERT(JS_ARRAY_LENGTH(js_common_atom_names) < 256);
     164                 : 
     165                 : const size_t js_common_atom_count = JS_ARRAY_LENGTH(js_common_atom_names);
     166                 : 
     167                 : const char js_undefined_str[]       = "undefined";
     168                 : const char js_object_str[]          = "object";
     169                 : 
     170                 : #define DEFINE_ATOM(id, text)          const char js_##id##_str[] = text;
     171                 : #define DEFINE_PROTOTYPE_ATOM(id)
     172                 : #define DEFINE_KEYWORD_ATOM(id)
     173                 : #include "jsatom.tbl"
     174                 : #undef DEFINE_ATOM
     175                 : #undef DEFINE_PROTOTYPE_ATOM
     176                 : #undef DEFINE_KEYWORD_ATOM
     177                 : 
     178                 : #if JS_HAS_GENERATORS
     179                 : const char js_close_str[]           = "close";
     180                 : const char js_send_str[]            = "send";
     181                 : #endif
     182                 : 
     183                 : /* Constant strings that are not atomized. */
     184                 : const char js_getter_str[]          = "getter";
     185                 : const char js_setter_str[]          = "setter";
     186                 : 
     187                 : /*
     188                 :  * For a browser build from 2007-08-09 after the browser starts up there are
     189                 :  * just 55 double atoms, but over 15000 string atoms. Not to penalize more
     190                 :  * economical embeddings allocating too much memory initially we initialize
     191                 :  * atomized strings with just 1K entries.
     192                 :  */
     193                 : #define JS_STRING_HASH_COUNT   1024
     194                 : 
     195                 : JSBool
     196           18761 : js_InitAtomState(JSRuntime *rt)
     197                 : {
     198           18761 :     JSAtomState *state = &rt->atomState;
     199                 : 
     200           18761 :     JS_ASSERT(!state->atoms.initialized());
     201           18761 :     if (!state->atoms.init(JS_STRING_HASH_COUNT))
     202               0 :         return false;
     203                 : 
     204           18761 :     JS_ASSERT(state->atoms.initialized());
     205           18761 :     return true;
     206                 : }
     207                 : 
     208                 : void
     209           18761 : js_FinishAtomState(JSRuntime *rt)
     210                 : {
     211           18761 :     JSAtomState *state = &rt->atomState;
     212                 : 
     213           18761 :     if (!state->atoms.initialized()) {
     214                 :         /*
     215                 :          * We are called with uninitialized state when JS_NewRuntime fails and
     216                 :          * calls JS_DestroyRuntime on a partially initialized runtime.
     217                 :          */
     218               0 :         return;
     219                 :     }
     220                 : 
     221           18761 :     FreeOp fop(rt, false, false);
     222         2812080 :     for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront())
     223         2793319 :         r.front().asPtr()->finalize(&fop);
     224                 : }
     225                 : 
     226                 : bool
     227           18761 : js::InitCommonAtoms(JSContext *cx)
     228                 : {
     229           18761 :     JSAtomState *state = &cx->runtime->atomState;
     230           18761 :     JSAtom **atoms = state->commonAtomsStart();
     231         2570257 :     for (size_t i = 0; i < ArrayLength(js_common_atom_names); i++, atoms++) {
     232                 :         JSAtom *atom = js_Atomize(cx, js_common_atom_names[i], strlen(js_common_atom_names[i]),
     233         2551496 :                                   InternAtom);
     234         2551496 :         if (!atom)
     235               0 :             return false;
     236         2551496 :         *atoms = atom->asPropertyName();
     237                 :     }
     238                 : 
     239           18761 :     state->clearLazyAtoms();
     240           18761 :     cx->runtime->emptyString = state->emptyAtom;
     241           18761 :     return true;
     242                 : }
     243                 : 
     244                 : void
     245           18761 : js::FinishCommonAtoms(JSRuntime *rt)
     246                 : {
     247           18761 :     rt->emptyString = NULL;
     248           18761 :     rt->atomState.junkAtoms();
     249           18761 : }
     250                 : 
     251                 : void
     252           41836 : js::MarkAtomState(JSTracer *trc, bool markAll)
     253                 : {
     254           41836 :     JSRuntime *rt = trc->runtime;
     255           41836 :     JSAtomState *state = &rt->atomState;
     256                 : 
     257           41836 :     if (markAll) {
     258         6358114 :         for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
     259         6347269 :             JSAtom *tmp = r.front().asPtr();
     260         6347269 :             MarkStringRoot(trc, &tmp, "locked_atom");
     261         6347269 :             JS_ASSERT(tmp == r.front().asPtr());
     262                 :         }
     263                 :     } else {
     264        19000010 :         for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
     265        18969019 :             AtomStateEntry entry = r.front();
     266        18969019 :             if (!entry.isTagged())
     267        14354441 :                 continue;
     268                 : 
     269         4614578 :             JSAtom *tmp = entry.asPtr();
     270         4614578 :             MarkStringRoot(trc, &tmp, "interned_atom");
     271         4614578 :             JS_ASSERT(tmp == entry.asPtr());
     272                 :         }
     273                 :     }
     274           41836 : }
     275                 : 
     276                 : void
     277           38427 : js::SweepAtomState(JSRuntime *rt)
     278                 : {
     279           38427 :     JSAtomState *state = &rt->atomState;
     280                 : 
     281        23385873 :     for (AtomSet::Enum e(state->atoms); !e.empty(); e.popFront()) {
     282        23347446 :         AtomStateEntry entry = e.front();
     283                 : 
     284        23347446 :         if (entry.isTagged()) {
     285                 :             /* Pinned or interned key cannot be finalized. */
     286         5722520 :             JS_ASSERT(!IsAboutToBeFinalized(entry.asPtr()));
     287         5722520 :             continue;
     288                 :         }
     289                 : 
     290        17624926 :         if (IsAboutToBeFinalized(entry.asPtr()))
     291         9071906 :             e.removeFront();
     292                 :     }
     293           38427 : }
     294                 : 
     295                 : bool
     296              18 : AtomIsInterned(JSContext *cx, JSAtom *atom)
     297                 : {
     298                 :     /* We treat static strings as interned because they're never collected. */
     299              18 :     if (StaticStrings::isStatic(atom))
     300               5 :         return true;
     301                 : 
     302              13 :     AtomSet::Ptr p = cx->runtime->atomState.atoms.lookup(atom);
     303              13 :     if (!p)
     304               0 :         return false;
     305                 : 
     306              13 :     return p->isTagged();
     307                 : }
     308                 : 
     309                 : enum OwnCharsBehavior
     310                 : {
     311                 :     CopyChars, /* in other words, do not take ownership */
     312                 :     TakeCharOwnership
     313                 : };
     314                 : 
     315                 : /*
     316                 :  * Callers passing OwnChars have freshly allocated *pchars and thus this
     317                 :  * memory can be used as a new JSAtom's buffer without copying. When this flag
     318                 :  * is set, the contract is that callers will free *pchars iff *pchars == NULL.
     319                 :  */
     320                 : JS_ALWAYS_INLINE
     321                 : static JSAtom *
     322        34665169 : AtomizeInline(JSContext *cx, const jschar **pchars, size_t length,
     323                 :               InternBehavior ib, OwnCharsBehavior ocb = CopyChars)
     324                 : {
     325        34665169 :     const jschar *chars = *pchars;
     326                 : 
     327        34665169 :     if (JSAtom *s = cx->runtime->staticStrings.lookup(chars, length))
     328         2694690 :         return s;
     329                 : 
     330        31970479 :     AtomSet &atoms = cx->runtime->atomState.atoms;
     331        63940958 :     AtomSet::AddPtr p = atoms.lookupForAdd(AtomHasher::Lookup(chars, length));
     332                 : 
     333        31970479 :     if (p) {
     334        20105254 :         JSAtom *atom = p->asPtr();
     335        20105254 :         p->setTagged(bool(ib));
     336        20105254 :         return atom;
     337                 :     }
     338                 : 
     339        23730450 :     SwitchToCompartment sc(cx, cx->runtime->atomsCompartment);
     340                 : 
     341                 :     JSFixedString *key;
     342                 : 
     343        11865225 :     if (ocb == TakeCharOwnership) {
     344         1269289 :         key = js_NewString(cx, const_cast<jschar *>(chars), length);
     345         1269289 :         if (!key)
     346               0 :             return NULL;
     347         1269289 :         *pchars = NULL; /* Called should not free *pchars. */
     348                 :     } else {
     349        10595936 :         JS_ASSERT(ocb == CopyChars);
     350        10595936 :         key = js_NewStringCopyN(cx, chars, length);
     351        10595936 :         if (!key)
     352               0 :             return NULL;
     353                 :     }
     354                 : 
     355                 :     /*
     356                 :      * We have to relookup the key as the last ditch GC invoked from the
     357                 :      * string allocation or OOM handling unlocks the atomsCompartment.
     358                 :      *
     359                 :      * N.B. this avoids recomputing the hash but still has a potential
     360                 :      * (# collisions * # chars) comparison cost in the case of a hash
     361                 :      * collision!
     362                 :      */
     363        11865225 :     AtomHasher::Lookup lookup(chars, length);
     364        11865225 :     if (!atoms.relookupOrAdd(p, lookup, AtomStateEntry((JSAtom *) key, bool(ib)))) {
     365               0 :         JS_ReportOutOfMemory(cx); /* SystemAllocPolicy does not report */
     366               0 :         return NULL;
     367                 :     }
     368                 : 
     369        11865225 :     return key->morphAtomizedStringIntoAtom();
     370                 : }
     371                 : 
     372                 : static JSAtom *
     373        30834610 : Atomize(JSContext *cx, const jschar **pchars, size_t length,
     374                 :         InternBehavior ib, OwnCharsBehavior ocb = CopyChars)
     375                 : {
     376        30834610 :     return AtomizeInline(cx, pchars, length, ib, ocb);
     377                 : }
     378                 : 
     379                 : JSAtom *
     380         1519121 : js_AtomizeString(JSContext *cx, JSString *str, InternBehavior ib)
     381                 : {
     382         1519121 :     if (str->isAtom()) {
     383          559200 :         JSAtom &atom = str->asAtom();
     384                 :         /* N.B. static atoms are effectively always interned. */
     385          559200 :         if (ib != InternAtom || js::StaticStrings::isStatic(&atom))
     386          559199 :             return &atom;
     387                 : 
     388               1 :         AtomSet &atoms = cx->runtime->atomState.atoms;
     389               1 :         AtomSet::Ptr p = atoms.lookup(AtomHasher::Lookup(&atom));
     390               1 :         JS_ASSERT(p); /* Non-static atom must exist in atom state set. */
     391               1 :         JS_ASSERT(p->asPtr() == &atom);
     392               1 :         JS_ASSERT(ib == InternAtom);
     393               1 :         p->setTagged(bool(ib));
     394               1 :         return &atom;
     395                 :     }
     396                 : 
     397          959921 :     if (str->isAtom())
     398               0 :         return &str->asAtom();
     399                 : 
     400          959921 :     size_t length = str->length();
     401          959921 :     const jschar *chars = str->getChars(cx);
     402          959921 :     if (!chars)
     403               0 :         return NULL;
     404                 : 
     405          959921 :     JS_ASSERT(length <= JSString::MAX_LENGTH);
     406          959921 :     return Atomize(cx, &chars, length, ib);
     407                 : }
     408                 : 
     409                 : JSAtom *
     410        29874689 : js_Atomize(JSContext *cx, const char *bytes, size_t length, InternBehavior ib, FlationCoding fc)
     411                 : {
     412        59749378 :     CHECK_REQUEST(cx);
     413                 : 
     414        29874689 :     if (!JSString::validateLength(cx, length))
     415               0 :         return NULL;
     416                 : 
     417                 :     /*
     418                 :      * Avoiding the malloc in InflateString on shorter strings saves us
     419                 :      * over 20,000 malloc calls on mozilla browser startup. This compares to
     420                 :      * only 131 calls where the string is longer than a 31 char (net) buffer.
     421                 :      * The vast majority of atomized strings are already in the hashtable. So
     422                 :      * js_AtomizeString rarely has to copy the temp string we make.
     423                 :      */
     424                 :     static const unsigned ATOMIZE_BUF_MAX = 32;
     425                 :     jschar inflated[ATOMIZE_BUF_MAX];
     426        29874689 :     size_t inflatedLength = ATOMIZE_BUF_MAX - 1;
     427                 : 
     428                 :     const jschar *chars;
     429        29874689 :     OwnCharsBehavior ocb = CopyChars;
     430        29874689 :     if (length < ATOMIZE_BUF_MAX) {
     431        28288384 :         if (fc == CESU8Encoding)
     432               0 :             InflateUTF8StringToBuffer(cx, bytes, length, inflated, &inflatedLength, fc);
     433                 :         else
     434        28288384 :             InflateStringToBuffer(cx, bytes, length, inflated, &inflatedLength);
     435        28288384 :         inflated[inflatedLength] = 0;
     436        28288384 :         chars = inflated;
     437                 :     } else {
     438         1586305 :         inflatedLength = length;
     439         1586305 :         chars = InflateString(cx, bytes, &inflatedLength, fc);
     440         1586305 :         if (!chars)
     441               0 :             return NULL;
     442         1586305 :         ocb = TakeCharOwnership;
     443                 :     }
     444                 : 
     445        29874689 :     JSAtom *atom = Atomize(cx, &chars, inflatedLength, ib, ocb);
     446        29874689 :     if (ocb == TakeCharOwnership && chars)
     447          317016 :         cx->free_((void *)chars);
     448        29874689 :     return atom;
     449                 : }
     450                 : 
     451                 : JSAtom *
     452         3830559 : js_AtomizeChars(JSContext *cx, const jschar *chars, size_t length, InternBehavior ib)
     453                 : {
     454         7661118 :     CHECK_REQUEST(cx);
     455                 : 
     456         3830559 :     if (!JSString::validateLength(cx, length))
     457               0 :         return NULL;
     458                 : 
     459         3830559 :     return AtomizeInline(cx, &chars, length, ib);
     460                 : }
     461                 : 
     462                 : JSAtom *
     463               0 : js_GetExistingStringAtom(JSContext *cx, const jschar *chars, size_t length)
     464                 : {
     465               0 :     if (JSAtom *atom = cx->runtime->staticStrings.lookup(chars, length))
     466               0 :         return atom;
     467               0 :     if (AtomSet::Ptr p = cx->runtime->atomState.atoms.lookup(AtomHasher::Lookup(chars, length)))
     468               0 :         return p->asPtr();
     469               0 :     return NULL;
     470                 : }
     471                 : 
     472                 : #ifdef DEBUG
     473                 : JS_FRIEND_API(void)
     474               0 : js_DumpAtoms(JSContext *cx, FILE *fp)
     475                 : {
     476               0 :     JSAtomState *state = &cx->runtime->atomState;
     477                 : 
     478               0 :     fprintf(fp, "atoms table contents:\n");
     479               0 :     unsigned number = 0;
     480               0 :     for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
     481               0 :         AtomStateEntry entry = r.front();
     482               0 :         fprintf(fp, "%3u ", number++);
     483               0 :         JSAtom *key = entry.asPtr();
     484               0 :         FileEscapedString(fp, key, '"');
     485               0 :         if (entry.isTagged())
     486               0 :             fputs(" interned", fp);
     487               0 :         putc('\n', fp);
     488                 :     }
     489               0 :     putc('\n', fp);
     490               0 : }
     491                 : #endif
     492                 : 
     493                 : #if JS_BITS_PER_WORD == 32
     494                 : # define TEMP_SIZE_START_LOG2   5
     495                 : #else
     496                 : # define TEMP_SIZE_START_LOG2   6
     497                 : #endif
     498                 : #define TEMP_SIZE_LIMIT_LOG2    (TEMP_SIZE_START_LOG2 + NUM_TEMP_FREELISTS)
     499                 : 
     500                 : #define TEMP_SIZE_START         JS_BIT(TEMP_SIZE_START_LOG2)
     501                 : #define TEMP_SIZE_LIMIT         JS_BIT(TEMP_SIZE_LIMIT_LOG2)
     502                 : 
     503                 : JS_STATIC_ASSERT(TEMP_SIZE_START >= sizeof(JSHashTable));
     504                 : 
     505                 : void
     506          259010 : js_InitAtomMap(JSContext *cx, AtomIndexMap *indices, JSAtom **atoms)
     507                 : {
     508          259010 :     if (indices->isMap()) {
     509                 :         typedef AtomIndexMap::WordMap WordMap;
     510             648 :         const WordMap &wm = indices->asMap();
     511           40455 :         for (WordMap::Range r = wm.all(); !r.empty(); r.popFront()) {
     512           39807 :             JSAtom *atom = r.front().key;
     513           39807 :             jsatomid index = r.front().value;
     514           39807 :             JS_ASSERT(index < indices->count());
     515           39807 :             atoms[index] = atom;
     516                 :         }
     517                 :     } else {
     518          870704 :         for (const AtomIndexMap::InlineElem *it = indices->asInline(), *end = indices->inlineEnd();
     519                 :              it != end; ++it) {
     520          612342 :             JSAtom *atom = it->key;
     521          612342 :             if (!atom)
     522               0 :                 continue;
     523          612342 :             JS_ASSERT(it->value < indices->count());
     524          612342 :             atoms[it->value] = atom;
     525                 :         }
     526                 :     }
     527          259010 : }
     528                 : 
     529                 : namespace js {
     530                 : 
     531                 : bool
     532             233 : IndexToIdSlow(JSContext *cx, uint32_t index, jsid *idp)
     533                 : {
     534             233 :     JS_ASSERT(index > JSID_INT_MAX);
     535                 : 
     536                 :     jschar buf[UINT32_CHAR_BUFFER_LENGTH];
     537             233 :     RangedPtr<jschar> end(ArrayEnd(buf), buf, ArrayEnd(buf));
     538             233 :     RangedPtr<jschar> start = BackfillIndexInCharBuffer(index, end);
     539                 : 
     540             233 :     JSAtom *atom = js_AtomizeChars(cx, start.get(), end - start);
     541             233 :     if (!atom)
     542               0 :         return false;
     543                 : 
     544             233 :     *idp = ATOM_TO_JSID(atom);
     545             233 :     JS_ASSERT(js_CheckForStringIndex(*idp) == *idp);
     546             233 :     return true;
     547                 : }
     548                 : 
     549                 : } /* namespace js */
     550                 : 
     551                 : /* JSBOXEDWORD_INT_MAX as a string */
     552                 : #define JSBOXEDWORD_INT_MAX_STRING "1073741823"
     553                 : 
     554                 : /*
     555                 :  * Convert string indexes that convert to int jsvals as ints to save memory.
     556                 :  * Care must be taken to use this macro every time a property name is used, or
     557                 :  * else double-sets, incorrect property cache misses, or other mistakes could
     558                 :  * occur.
     559                 :  */
     560                 : jsid
     561       164617159 : js_CheckForStringIndex(jsid id)
     562                 : {
     563       164617159 :     if (!JSID_IS_ATOM(id))
     564        17816541 :         return id;
     565                 : 
     566       146800618 :     JSAtom *atom = JSID_TO_ATOM(id);
     567       146800618 :     const jschar *s = atom->chars();
     568       146800618 :     jschar ch = *s;
     569                 : 
     570       146800618 :     JSBool negative = (ch == '-');
     571       146800618 :     if (negative)
     572           27276 :         ch = *++s;
     573                 : 
     574       146800618 :     if (!JS7_ISDEC(ch))
     575       145783263 :         return id;
     576                 : 
     577         1017355 :     size_t n = atom->length() - negative;
     578         1017355 :     if (n > sizeof(JSBOXEDWORD_INT_MAX_STRING) - 1)
     579              54 :         return id;
     580                 : 
     581         1017301 :     const jschar *cp = s;
     582         1017301 :     const jschar *end = s + n;
     583                 : 
     584         1017301 :     uint32_t index = JS7_UNDEC(*cp++);
     585         1017301 :     uint32_t oldIndex = 0;
     586         1017301 :     uint32_t c = 0;
     587                 : 
     588         1017301 :     if (index != 0) {
     589         2047844 :         while (JS7_ISDEC(*cp)) {
     590           77810 :             oldIndex = index;
     591           77810 :             c = JS7_UNDEC(*cp);
     592           77810 :             index = 10 * index + c;
     593           77810 :             cp++;
     594                 :         }
     595                 :     }
     596                 : 
     597                 :     /*
     598                 :      * Non-integer indexes can't be represented as integers.  Also, distinguish
     599                 :      * index "-0" from "0", because JSBOXEDWORD_INT cannot.
     600                 :      */
     601         1017301 :     if (cp != end || (negative && index == 0))
     602          885694 :         return id;
     603                 : 
     604          131607 :     if (negative) {
     605            3381 :         if (oldIndex < -(JSID_INT_MIN / 10) ||
     606                 :             (oldIndex == -(JSID_INT_MIN / 10) && c <= (-JSID_INT_MIN % 10)))
     607                 :         {
     608            2634 :             id = INT_TO_JSID(-int32_t(index));
     609                 :         }
     610                 :     } else {
     611          128226 :         if (oldIndex < JSID_INT_MAX / 10 ||
     612                 :             (oldIndex == JSID_INT_MAX / 10 && c <= (JSID_INT_MAX % 10)))
     613                 :         {
     614          127291 :             id = INT_TO_JSID(int32_t(index));
     615                 :         }
     616                 :     }
     617                 : 
     618          131607 :     return id;
     619                 : }
     620                 : 
     621                 : #if JS_HAS_XML_SUPPORT
     622                 : bool
     623               6 : js_InternNonIntElementIdSlow(JSContext *cx, JSObject *obj, const Value &idval,
     624                 :                              jsid *idp)
     625                 : {
     626               6 :     JS_ASSERT(idval.isObject());
     627               6 :     if (obj->isXML()) {
     628               0 :         *idp = OBJECT_TO_JSID(&idval.toObject());
     629               0 :         return true;
     630                 :     }
     631                 : 
     632               6 :     if (js_GetLocalNameFromFunctionQName(&idval.toObject(), idp, cx))
     633               0 :         return true;
     634                 : 
     635               6 :     return js_ValueToStringId(cx, idval, idp);
     636                 : }
     637                 : 
     638                 : bool
     639             819 : js_InternNonIntElementIdSlow(JSContext *cx, JSObject *obj, const Value &idval,
     640                 :                              jsid *idp, Value *vp)
     641                 : {
     642             819 :     JS_ASSERT(idval.isObject());
     643             819 :     if (obj->isXML()) {
     644               0 :         JSObject &idobj = idval.toObject();
     645               0 :         *idp = OBJECT_TO_JSID(&idobj);
     646               0 :         vp->setObject(idobj);
     647               0 :         return true;
     648                 :     }
     649                 : 
     650             819 :     if (js_GetLocalNameFromFunctionQName(&idval.toObject(), idp, cx)) {
     651               9 :         *vp = IdToValue(*idp);
     652               9 :         return true;
     653                 :     }
     654                 : 
     655             810 :     if (js_ValueToStringId(cx, idval, idp)) {
     656             810 :         vp->setString(JSID_TO_STRING(*idp));
     657             810 :         return true;
     658                 :     }
     659               0 :     return false;
     660                 : }
     661                 : #endif
     662                 : 
     663                 : template<XDRMode mode>
     664                 : bool
     665           15742 : js::XDRAtom(XDRState<mode> *xdr, JSAtom **atomp)
     666                 : {
     667                 :     if (mode == XDR_ENCODE) {
     668            7871 :         JSString *str = *atomp;
     669            7871 :         return xdr->codeString(&str);
     670                 :     }
     671                 : 
     672                 :     /*
     673                 :      * Inline XDRState::codeString when decoding to avoid JSString allocation
     674                 :      * for already existing atoms. See bug 321985.
     675                 :      */
     676                 :     uint32_t nchars;
     677            7871 :     if (!xdr->codeUint32(&nchars))
     678               0 :         return false;
     679                 : 
     680            7871 :     JSContext *cx = xdr->cx();
     681                 :     JSAtom *atom;
     682                 : #if IS_LITTLE_ENDIAN
     683                 :     /* Directly access the little endian chars in the XDR buffer. */
     684            7871 :     const jschar *chars = reinterpret_cast<const jschar *>(xdr->buf.read(nchars * sizeof(jschar)));
     685            7871 :     atom = js_AtomizeChars(cx, chars, nchars);
     686                 : #else
     687                 :     /*
     688                 :      * We must copy chars to a temporary buffer to convert between little and
     689                 :      * big endian data.
     690                 :      */ 
     691                 :     jschar *chars;
     692                 :     jschar stackChars[256];
     693                 :     if (nchars <= ArrayLength(stackChars)) {
     694                 :         chars = stackChars;
     695                 :     } else {
     696                 :         /*
     697                 :          * This is very uncommon. Don't use the tempLifoAlloc arena for this as
     698                 :          * most allocations here will be bigger than tempLifoAlloc's default
     699                 :          * chunk size.
     700                 :          */
     701                 :         chars = static_cast<jschar *>(cx->runtime->malloc_(nchars * sizeof(jschar)));
     702                 :         if (!chars)
     703                 :             return false;
     704                 :     }
     705                 : 
     706                 :     JS_ALWAYS_TRUE(xdr->codeChars(chars, nchars));
     707                 :     atom = js_AtomizeChars(cx, chars, nchars);
     708                 :     if (chars != stackChars)
     709                 :         Foreground::free_(chars);
     710                 : #endif /* !IS_LITTLE_ENDIAN */
     711                 : 
     712            7871 :     if (!atom)
     713               0 :         return false;
     714            7871 :     *atomp = atom;
     715            7871 :     return true;
     716                 : }
     717                 : 
     718                 : template bool
     719                 : js::XDRAtom(XDRState<XDR_ENCODE> *xdr, JSAtom **atomp);
     720                 : 
     721                 : template bool
     722                 : js::XDRAtom(XDRState<XDR_DECODE> *xdr, JSAtom **atomp);
     723                 : 

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